The ikiwiki project strongly encourages collaboration through ikiwiki itself,
and thus does not have a mailing list. Anyone can create an account on
ikiwiki's own wiki. ikiwiki provides a bug tracker, a
TODO list, and "discussion" sub-pages for every page, as well as a
forum for general questions and discussion. ikiwiki
developers monitor RecentChanges closely, via the webpage, email,
and IRC, and respond in a timely fashion.

You could also drop by the IRC channel #ikiwiki on
OFTC (irc.oftc.net).